The Redding .188 Heat-Treated Steel Neck Sizing Bushing (Model 73188) is a precision reloading component designed to control cartridge case neck tension without overworking brass or inducing neck runout. Machined from heat-treated steel, the bushing sizes case necks to an exact inside diameter, eliminating the need for standard expander balls. Featuring an industry-standard 1/2 in (12.7 mm) outer diameter, this bushing is fully compatible with Redding Type S Neck Sizing Dies, Type S Full Length Dies, Competition Bushing Neck Sizing Dies, as well as standard 1/2 in bushing dies from Wilson, RCBS, and Hornady.

Key Features

  • Precise Neck Sizing: Delivers an exact 0.188 in internal sizing diameter to set precise neck tension in 0.001 in increments for sub-calibre cartridges.
  • Hardened Steel Construction: Heat-treated to a surface hardness of Rc 60–62 with a hand-polished internal bore to lower sizing friction and extend brass life.
  • Universal Die Fit: Features a standard 1/2 in (12.7 mm) outer diameter and a 3/8 in (9.525 mm) length for drop-in use across standard bushing-style reloading dies.
  • Size Identification: Stamped with the .188 size marking for quick identification on the reloading bench.

Product Specifications

  • Internal Sizing Diameter: 0.188 in
  • Outer Diameter: 1/2 in (12.7 mm)
  • Length: 3/8 in (9.525 mm)
  • Material: Heat-treated steel
  • Surface Hardness: Rc 60–62 (hand-polished interior)
  • Weight: Approximately 10–15 g
  • Die Compatibility: Redding Type S Bushing Full Length Dies, Redding Type S Neck Sizing Dies, Redding Competition Bushing Neck Sizing Dies, and 1/2 in O.D. bushing dies from Wilson, RCBS, and Hornady
  • Lubrication Requirement: Case neck lubrication required prior to sizing

Who is the Redding .188 Heat-Treated Steel Neck Sizing Bushing for?

  • Handloaders loading .17-calibre families — sets precise 0.001 in to 0.002 in neck tension on .17 Hornet, .17 Remington, and .17 Fireball cases measuring approximately 0.189 in to 0.190 in loaded outside diameter using a dedicated 0.188 in internal sizing diameter neck sizing bushing.
  • Competitive benchrest shooters reloading sub-calibre ammunition — minimizes cartridge runout and extends brass longevity via an Rc 60–62 hand-polished internal bore that fits standard 1/2 in outer diameter bushing dies without using an expander ball.

Less suitable for: Handloaders who require dry neck sizing without case lubricant or extended commercial-scale wear resistance, who are better served by a Titanium Nitride (TiN) coated neck sizing bushing; or reloaders whose brass neck wall thickness requires sizing outside the .188 in dimension, who should step up or down to alternate steel bushings in .001 in increments.

SKU RD41747LP
Model # 73188
Brand Redding
Shipping Weight 1.0000kg

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